September 2012 in the continental USA was almost exactly average compared to the last 15 years.

September 2012 was 3F colder than September 1998. The trend for Septembers since 1997 was dropping -.31F / decade.

From 1895 to 2012, 22 Septembers were warmer (1998 was the warmest).

Some of the warmer Septembers were: 1931,1933,1939,1922,1925,1938,1921,1947,1897,1954,1960,1963,1936,1906.

1897?